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A033594
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(n-1)*(2*n-1)*(3*n-1).
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2
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-1, 0, 15, 80, 231, 504, 935, 1560, 2415, 3536, 4959, 6720, 8855, 11400, 14391, 17864, 21855, 26400, 31535, 37296, 43719, 50840, 58695, 67320, 76751, 87024, 98175, 110240, 123255, 137256, 152279, 168360
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| The sequence of n such that n is prime and (2*n+1) is prime is the sequence of Sophie Germain primes A005384 and the subsequence of those for which in addition (3*n+2) is prime is A067256. - Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 15 2004
a(n)*A016921(n)+1 = A051866(n)^2 - Bruno Berselli, May 23 2011
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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MATHEMATICA
| Table[(n-1)*(2*n-1)*(3*n-1), {n, 0, 5!}] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Apr 28 2010]
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PROG
| (MAGMA) [(n-1)*(2*n-1)*(3*n-1): n in [0..40]]; // Vincenzo Librandi, May 24 2011
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CROSSREFS
| Cf. A005384, A067256.
Sequence in context: A189922 A085808 A180577 * A059377 A123865 A024002
Adjacent sequences: A033591 A033592 A033593 * A033595 A033596 A033597
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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